Is this even possible with xara software

[Initiostar]

When you look at the code detail https://greymattersuk.com/, the PNG images have been placed in a 'Slick' carousel; there are 8 x PNG images in a loop. The carousel sits in front of the background video, which in this case does not appear to do very much. The perception of depth in the PNG images has been created similar I guess to Egg's well explained approach.

It was fairly easy to mimic the effect using my third party slider, minus the usual controls; I did not bother with the video background. You could of course do the whole thing as an intro-video with your chosen video editor and have it run in the background.

Footnote:it would be interesting to gauge how long it takes for a visitor to get the headline message from this site?